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100
MCP live MCP 2026-07-28 streamable-http

Aiwyn Tax (formerly Column Tax)

ai.aiwyn/tax

Estimate your federal & state taxes using Aiwyn's tax engine that's filed over 1 million returns. Give Claude your tax documents (e.g. W-2s) and get a 1040 PDF back.

Listed in Claude connectors
Watch this dependency Share evidence report
Uptime
40.0%
5 direct probes · 30d
Response
1232ms
last probe
Tools
10
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://mcp.columnapi.com/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
10 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
10 items in total; 3 or more earns these points.
pass Describes itself 10/10
165 characters; more than 30 earns these points.

Tools · 10

check_tax

Check inputs to calculate a tax return for a given jurisdiction. The 'input' argument must conform to the JSON schema returned by the tax_namespace_schema tool. Returns 'Success' on success, or valida…

calculate_tax

Calculate a tax return for a given jurisdiction. The 'input' argument must conform to the JSON schema returned by the tax_namespace_schema tool. Returns computed tax return document on success, or val…

tax_years

List the launched tax years.

tax_jurisdictions

List all supported tax jurisdictions for a given tax year.

tax_namespace_schema

Get the TCB input schema for a single namespace (e.g. "irs1040", "irs1040_schedulec", "ca_form540"). Returns the properties and types for that namespace. HOW TO READ THE SCHEMA: (1) Each field referen…

tax_namespaces

List all available input namespaces for a given jurisdiction. Use the returned names with the tax_namespace_schema tool to get the schema for a specific namespace. Requires a jurisdiction (e.g. "us" f…

tax_simple_return

Call this FIRST when beginning any tax return. Returns the curated namespace list, top-level structure guide, example input, and step-by-step filing workflow. By default returns a simple scenario (sin…

generate_tax_pdf_tool

Start async PDF generation for a tax return. The 'input' argument must conform to the JSON schema returned by the tax_namespace_schema tool. Returns a job ID to poll with get_tax_pdf.Use the check_tax…

get_tax_pdf_tool

Check status of a PDF generation job. Returns the status and a download URL when completed, only use this tool after generating the tax PDF with the generate_tax_pdf tool and it successfully retur…

generate_uuid_v5

Generate a UUID v5 based on a source uuid and namespace.

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://mcp.columnapi.com/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "aiwyn_tax_(formerly_column_tax)": {
      "url": "https://mcp.columnapi.com/mcp",
      "transport": "streamable-http"
    }
  }
}